Again, three of the one-run games are home extra inning wins. Those games really shouldn't be counted because the inning that ends the game is never completed. Look at Saturday's game, when the sac fly was hit and Ramos scored, there was one out and a runner at 2nd. If the inning had continued, it's very possible (if not likely) that that run could have been scored and that would have made it a two-run win.
As a matter of fact, in the other two extra inning home one-run wins, there were runners in scoring position other than the winning run. In the Cincinnati game that ended 2-1 with the Werth hit, the bases were loaded with one out.
If you take those game out then we're 3-2 in one-run games.